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    <p>Why not Sender and Receiver be references to Customer objects. Going the other way, each Customer has a List of references to Transaction objects that it is participating in. If your design will allow for a circular reference, this is the way I would go.</p> <p>Something along these lines:</p> <pre><code>using System; using System.Collections.Generic; namespace Sample { public abstract class Customer { protected string _name; //... } public class PrivateCustomer : Customer { private List&lt;Transaction&gt; _transactions; //... } public class BusinessCustomer : Customer { private List&lt;Transaction&gt; _transactions; //... } public class Transaction { private Customer _sender; private Customer _receiver; private double _amount; private DateTime _date; private AccountType _accountType; //... } public enum AccountType { Downpayment, Regular } } </code></pre> <p>a revision taking into account the account information (no pun intended):</p> <pre><code>using System; using System.Collections.Generic; namespace Sample { public abstract class Customer { private List&lt;Account&gt; _accounts; protected string _name; //... } public class PrivateCustomer : Customer { //... } public class BusinessCustomer : Customer { //... } public class Transaction { private Account _sender; private Account _receiver; private double _amount; private DateTime _date; //... } public abstract class Account { private Customer _customer; private Collection&lt;Transaction&gt; _transactions; } public class RegularAccount { //... } public class DownpaymentAccount { //... } } </code></pre>
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    1. POWhere should i place transactions in this system
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    1. COTruth to be told, I am not sure what you mean. I am using c# if that helps you.
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    2. COIs this a homework assignment?
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    3. COI simply have had a discussion with a friend, on how to design something like this. We couldn't find an answer, so I am using SO as a third-party
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